On Wed, 30 Dec 2009, Mike Gerdts wrote:
Should the block size be a tunable so that page size of SSD (typically 4K, right?) and upcoming hard disks that sport a sector size > 512 bytes?
Enterprise SSDs are still in their infancy. The actual page size of an SSD could be almost anything. Due to lack of seek time concerns and the high cost of erasing a page, a SSD could be designed with a level of indirection so that multiple logical writes to disjoint offsets could be combined into a single SSD physical page. Likewise a large logical block could be subdivided into mutiple SSD pages, which are allocated on demand. Logic is cheap and SSDs are full of logic so it seems reasonable that future SSDs will do this, if not already, since similar logic enables wear-leveling.
Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
